S
M
T
W
T
F
S
30
72°
55°
31
79°
48°
1
88°
50°
2
88°
48°
3
81°
47°
4
81°
48°
5
77°
51°
6
77°
53°
7
73°
52°
8
71°
49°
9
77°
48°
10
78°
48°
11
78°
48°
12
75°
49°
13
73°
45°
14
72°
37°
15
80°
50°
16
80°
50°
17
70°
49°
18
71°
48°
19
77°
49°
20
77°
49°
21
69°
47°
22
70°
48°
23
77°
48°
24
75°
47°
25
66°
47°
26
74°
46°
27
75°
48°
28
74°
47°
29
73°
46°
30
72°
46°
1
74°
47°
2
73°
46°
3
71°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Havre
Havre's September 2026 forecast shows daily high temperatures ranging from 66° to 88°, with overnight lows between 37° and 53°. The average high for September is 75° with an average low of 48°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Havre. See also: October | November | December.
